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CN-122011766-A - Preparation method for improving energy storage performance of polyethersulfone dielectric medium by using relaxation ferroelectric for capacitor

CN122011766ACN 122011766 ACN122011766 ACN 122011766ACN-122011766-A

Abstract

The invention discloses a component regulation-based method (BFBTST) relaxation ferroelectric composite dielectric film, preparation method and application thereof, belonging to the technical field of dielectric energy storage materials, ferroelectric materials with different conductivities are obtained by regulating BFBTST chemical components, and x=0.4 (BF-BT-ST 3) nanoparticles are the filled phase, and the preparation of a polyethersulfone (1 BF-BT-ST 3/U) composite dielectric film with a relaxor ferroelectric filled phase BF-BT-ST 3 content of 1 wt% exhibits excellent high-temperature energy storage properties; experiments show that the discharge energy density of the 1 BF-BT-ST 3/U composite dielectric film can reach about when the temperature is 100 ℃ and the electric field strength is 380 kV/mm The invention has simple process and controllable performance, and provides an effective material system and design strategy for designing the next generation of high-performance high-temperature energy storage dielectric medium.

Inventors

  • CHI QINGGUO
  • YIN CHAO
  • WANG XUBIN
  • Han Peisen
  • ZHANG YUE
  • ZHANG TIANDONG
  • ZHANG CHANGHAI
  • WANG YUE
  • XIANG YANXIONG
  • CHU SONGCHAO
  • CHEN WEIWEI

Assignees

  • 哈尔滨理工大学
  • 厦门法拉电子股份有限公司
  • 安徽铜峰电子股份有限公司
  • 南通新江海动力电子有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (9)

  1. 1. A relaxor ferroelectric modified polyethersulfone dielectric comprising a relaxor ferroelectric as component (M) and a polyethersulfone matrix (PESU), wherein the component (M) comprises 、 And (3) with The respective molar ratio content is selected from (BFBTST) wherein x=0.1 to 0.6.
  2. 2. The relaxation ferroelectric modified polyethersulfone dielectric of claim 1, wherein component (M) is sol-gel based, self-propagating high temperature synthesis (BF-BT-ST) relaxor ferroelectric inorganic filler phase.
  3. 3. The relaxor ferroelectric modified polyethersulfone dielectric of claim 1, wherein the process of preparing the relaxor ferroelectric comprises the steps of: (1) Preparing a precursor solution, namely dissolving bismuth nitrate pentahydrate and ferric nitrate nonahydrate in acetic acid, stirring at a constant temperature of 60 ℃ to obtain a solution A, dissolving barium hydroxide octahydrate and strontium acetate in acetic acid, stirring at a constant temperature of 60 ℃, adding acetylacetone as a stabilizer after the solution is clarified, and slowly dropwise adding tetrabutyl titanate to obtain a solution B; (2) Blending and complexing, namely blending the clarified solution A and the clarified solution B, stirring at a constant temperature of 10-100 ℃ until the solution is clarified, then dripping ethanolamine and stirring until the solution is clarified, and obtaining stable blending sol; (3) Pouring the blending sol into a crucible, adding absolute ethyl alcohol as fuel, igniting with wiping paper under the windproof condition, and turning over in good time in the combustion process to fully burn the materials; (4) Drying and grinding, namely drying ash obtained by combustion at 50-150 ℃ for 8-24 hours, and grinding to obtain dry precursor powder; (5) And (3) sectional calcining, namely placing the precursor powder into a muffle furnace, heating to 250-350 ℃ at 1-5 ℃ per min, calcining for 1-3 hours, heating to 800-1000 ℃ at 3-8 ℃ per min, calcining for 1-3 hours, and cooling with the furnace to obtain BF-BT-ST nano particles.
  4. 4. The relaxor ferroelectric modified polyethersulfone dielectric of claim 3, wherein said BF-BT-ST nanoparticles have a perovskite structure and a particle size ranging from 50 to 100 nm.
  5. 5. A method of preparing a relaxor ferroelectric modified polyethersulfone dielectric as claimed in claim 1-4, comprising the steps of: (a) Preparing dispersion slurry, namely adding BF-BT-ST nano particles into N-methylpyrrolidone solution containing polyethersulfone according to the mass fraction of y wt% (y=0.1-5), and obtaining uniform composite precursor dispersion liquid through mechanical stirring and ultrasonic dispersion; (b) Blade coating to form film, namely coating the precursor dispersion liquid on a glass substrate, controlling the thickness of a wet film, and then drying for 8-16 hours at 40-80 ℃; (c) Gradient heat treatment, namely carrying out step heat treatment on the dried film under vacuum conditions, wherein the step heat treatment comprises treatment at 60-100 ℃ for 1-5 hours, treatment at 90-110 ℃ for 1-3 hours, treatment at 140-160 ℃ for 1-3 hours and treatment at 190-210 ℃ for 1-3 hours; (d) And (3) stripping and film collecting, namely stripping the film from the substrate after heat treatment to obtain the self-supporting relaxation ferroelectric improved polyethersulfone dielectric medium film.
  6. 6. The method according to claim 5, wherein the wet film thickness in the step (b) is controlled by a doctor blade to be 。
  7. 7. The method of preparing a polyether sulfone dielectric film according to claim 5, wherein the prepared relaxor ferroelectric has a thickness of 。
  8. 8. The relaxation ferroelectric modified polyethersulfone dielectric film as prepared by the method of claims 5-7, wherein the discharge energy density of said film at 200 ℃ and 240 kV/mm of electric field strength is not lower than The charge-discharge efficiency is not lower than 70%.
  9. 9. Use of a relaxor ferroelectric modified polyethersulfone dielectric film prepared according to the method of claims 5-7 in high temperature storage capacitors.

Description

Preparation method for improving energy storage performance of polyethersulfone dielectric medium by using relaxation ferroelectric for capacitor Technical Field The invention belongs to the technical field of dielectric energy storage materials, and particularly relates to a preparation method for improving the energy storage performance of polyether sulfone dielectric by using a relaxation ferroelectric for a capacitor. Background With the rapid development of renewable energy sources, electric vehicles, pulse power systems and other fields, the demands for high-power density, high-energy-storage efficiency and high-reliability energy storage devices are increasingly urgent. Polymer-based composite dielectric film capacitors are one of the key devices for high power energy storage due to their high breakdown strength, low loss and excellent mechanical flexibility. At present, although commercial biaxially oriented polypropylene (BOPP) films have high breakdown strength, the dielectric constant (2.2) and the energy storage density are low, and the increasing energy storage requirement is difficult to meet. Ferroelectric polymers such as polyvinylidene fluoride (PVDF) and its copolymers have higher dielectric constants and polarization strengths, but their energy storage efficiency is lower and their loss is greater. Relaxor ferroelectric ceramics (e.gA base group,Base material) has a high dielectric constant and a low remnant polarization, which is an ideal filler candidate, but how to achieve uniform dispersion in the polymer matrix, good interfacial bonding, and dielectric matching between filler-matrix remains a key challenge in improving the overall performance of the composite dielectric. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a component-based regulation and control method(BF-BT-ST) relaxation ferroelectric composite dielectric film, and preparation method and application thereof. The invention finely adjusts and controls chemical components of BF-BT-ST filling materialsThe content is,Content), realizes the dielectric property matching and interface optimization of the filler and the PESU matrix, thereby remarkably improving the energy storage density, the energy storage efficiency and the breakdown strength of the composite dielectric film in a wide temperature range and a high electric field In order to achieve the purpose, the invention is realized by adopting the following technical scheme: In one aspect the present invention provides a relaxor ferroelectric modified polyethersulfone dielectric comprising a relaxor ferroelectric as component (M) and a polyethersulfone matrix (PESU), in component (M) 、And (3) withThe respective molar ratio content is selected fromWherein x=0.1 to 0.6. Preferably, component (M) is based on sol-gel process, self-propagating high temperature synthesis(BF-BT-ST) relaxor ferroelectric inorganic filler phase. Preferably, the preparation process of the relaxor ferroelectric comprises the steps of: (1) Preparing a precursor solution, namely dissolving bismuth nitrate pentahydrate and ferric nitrate nonahydrate in acetic acid, stirring at a constant temperature of 60 ℃ to obtain a solution A, dissolving barium hydroxide octahydrate and strontium acetate in acetic acid, stirring at a constant temperature of 60 ℃, adding acetylacetone as a stabilizer after the solution is clarified, and slowly dropwise adding tetrabutyl titanate to obtain a solution B. (2) Blending and complexing, namely blending the clarified solution A and the clarified solution B, stirring at a constant temperature of 10-100 ℃ until the solution is clarified, then dripping ethanolamine and stirring until the solution is clarified, and obtaining stable blending sol; (3) Pouring the blending sol into a crucible, adding absolute ethyl alcohol as fuel, igniting with wiping paper under the windproof condition, and turning over in good time in the combustion process to fully burn the materials; (4) Drying and grinding, namely drying ash obtained by combustion at 50-150 ℃ for 8-24 hours, and grinding to obtain dry precursor powder; (5) And (3) sectional calcining, namely placing the precursor powder into a muffle furnace, heating to 250-350 ℃ at 1-5 ℃ per min, calcining for 1-3 hours, heating to 800-1000 ℃ at 3-8 ℃ per min, calcining for 1-3 hours, and cooling with the furnace to obtain BF-BT-ST nano particles. Preferably, the BF-BT-ST nano particles have perovskite structures, and the particle size ranges from 50 to 100 nm. In a second aspect, the present invention provides a method for preparing a relaxor ferroelectric modified polyethersulfone dielectric comprising the steps of: (a) Preparing dispersion slurry, namely adding BF-BT-ST nano particles into N-methylpyrrolidone solution containing polyethersulfone according to the mass fraction of y wt% (y=0.1-5), and obtaining uniform composite precursor dispersion liquid through mechanical stirring and ul